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Inner ear: The inner ear consists of the cochlea and vestibular apparatus. The cochlea is a component of. osseous labyrinth that contains perilymph and the cochlear duct. The cochlear duct is a component of. membranous labyrinth and contains endolymph. The cochlea makes 3.25 turns in the dog (2.5 in man) around. a core of bone (called the modiolus) through which the cochlear nerve. passes. The entire complex resembles a snailâs shell (whence the term. cochlea is derived).
The Normal Heart Rhythm. The normal heart rhythm is controlled by a tiny structure called the sinus node, which is located near the top of the heart's right atrium. The sinus node generates the electrical signal that initiates the heartbeat and controls the heart rate.